t46s + ehs36 + exp40 + sennheiser dw can't catch calls with button

[joseba]

Hi,

we've just bought 6 T46s phones, with their EHS36 adapters to use Sennheiser DW wireless headsets with them.

Two of those combos work great, but in the other four, that happen to be using also EXP40 extension panels, we're unable to use the button of the headset to catch / hang the calls...

As soon as we disconnect the panels everything works fine...

We've updated the firmware for all devices (t46s, ehs36, exp40 and dw) to its latest, and no change in behaviour.

Thanks in advance...